Re: [gsl-dev] replace the .bmp splashscreen

[Herbert Duerr]

On Apr 15, 2009, at 7:26 AM, eric b wrote:
Since I see there is a .png loader in OOo,  I'm searching how to  
replace the .bmp splashscreen with a .png one. The idea is to use  
transparency with the splashscreen.

For that, I modified splash.cxx in desktop/source/splash, with the  
idea to use BitmapEx class (is it correct?), but I'm a bit stuck  
about what exact stream type use .. and so on, and I need more  
information.

More precisely, I need tracks on what has to be done (the  
mechanism), what class use exactly. e.g.,

Create a SvFileStream/SvMemoryStream/ etc. (see tools/stream.hxx)
Create a PNGReader for that stream (see vcl/pngread.hxx)
Do a Read() on that PNGReader to get the BitmapEx.

I see implimagtree.cxx does use a stream, but not exactly the same  
as the one used with the bmp loader. Why, and what do instead  
for .png ? )

I guess the ImplImageTree has different requirements because it reads  
an image from inside a zip-container.

Last, some info about the fast path who could be used would be great  
too. And if there is work in progress, I'd be glad to help, because  
looks like thre is something extremely important for OOo to do (IMHO).


I'm not sure what you mean with fast path? The PNG reader is already  
quite fast. It can be faster if you just need to read just a thumbnail  
of a PNG,. Then you could give the PNGReader a preview-size hint; if  
the PNG was stored as "interlaced" this becomes even faster.

---
Herbert Duerr
du...@sun.com




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